I got a party Q for my WSM and decided that I wanted to try out the plugs instead of foil tape if possible. I ordered the below in both 3/4" and 1/2" (the $3 waste on 2 plugs i won't need is still worth it), but I just want to be sure these are safe. Pretty sure nickel plating is what's used on grilling surfaces, but with all the dangers involved in using the wrong metal, i figured a double check with you guys would be worth it. Thanks in advance.

Everbilt 1/2 in. Nickel-Plated Steel Hole Plug 807778 - The Home Depot
Enjoy the Crown Bolt 1/2 in. Nickel-Plated Steel Hole Plug 13098, fastener is a cosmetic plug with adjustable prongs used to fill holes from The Home Depot
www.homedepot.com